描述了在共氧化剂N-甲基吗啉N-氧化物(NMO)存在下在丙酮/ H 2 O中的一系列环己二烯的催化双渗透作用。多元醇的形成与环己二烯立体有择发生3,7,和11a中,从而导致四醇5A,以及图9a和同种异体肌醇(14A分别地)。相反,反式-环己二烯二醇15a给出了立体异构肌醇18a(epi),19a(neo)和20a(手电筒)。高场NMR使多羟基化衍生物的构象分析更加清晰。
Chiral benzazaboroles as catalysts for enantioselective sulfonylation of <i>cis</i>-1,2-diols
作者:Satoru Kuwano、Yusei Hosaka、Takayoshi Arai
DOI:10.1039/c8ob03205j
日期:——
A newly developed benzazaborole smoothly catalyzed the enantioselective sulfonylation of cis-1,2-diols. Using a chiral benzazaborole/NMI co-catalyst system, various sulfonate esters were prepared in high yields with good enantioselectivities.
The synthesis and directed dihydroxylation of a series of homoallylic alcohols and trichloroacetamides is described. Using the combination of OsO4 and TMEDA, moderate to high levels of stereoselectivity were obtained, depending upon the structure of the substrate. Proof of the structure of two osmate esters was obtained through X-ray crystallography.